Re: dual head r128

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Gabriel Paubert writes:

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On the kernel side, one of the PCI IO busses will be mapped to ISA. What
I'll do is basically to change the kernel inb/outb functions to do
something like

if (addr < 64k)
do_io(isa_io_base + addr)
else
do_io(addr)

Gabriel> No please, is there anybody bloat-conscious on this damned list ? Burying
Gabriel> more and more code inside each {in,out}[bwl] is not the solution.

Gabriel> Just define a macro ISA_PORT or something like this and update the kernel
Gabriel> to replace all the in/out to fixed ports to do in/out(ISA_PORT(n)). If you
Gabriel> don't do it you'll get a nice panic so you'll find all the places quite
Gabriel> fast.

	Yes, it is very important to avoid adding many layers of branches
to the code if anyone cares about performance.

David

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